// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef MEDIA_BASE_SUBSAMPLE_ENTRY_H_
#define MEDIA_BASE_SUBSAMPLE_ENTRY_H_

#include <stdint.h>

namespace media {

// The Common Encryption spec provides for subsample encryption, where portions
// of a sample are set in cleartext. A SubsampleEntry specifies the number of
// clear and encrypted bytes in each subsample. For decryption, all of the
// encrypted bytes in a sample should be considered a single logical stream,
// regardless of how they are divided into subsamples, and the clear bytes
// should not be considered as part of decryption. This is logically equivalent
// to concatenating all 'cypher_bytes' portions of subsamples, decrypting that
// result, and then copying each byte from the decrypted block over the
// position of the corresponding encrypted byte.
struct SubsampleEntry {
    SubsampleEntry()
        : clear_bytes(0)
        , cypher_bytes(0)
    {
    }
    SubsampleEntry(uint32_t clear_bytes, uint32_t cypher_bytes)
        : clear_bytes(clear_bytes)
        , cypher_bytes(cypher_bytes)
    {
    }
    uint32_t clear_bytes;
    uint32_t cypher_bytes;
};

} // namespace media

#endif // MEDIA_BASE_SUBSAMPLE_ENTRY_H_
